Yes, I used the template and then widened the holes a bit more so the stock vents would fit.
As for the center vent, you'll need to buy a new bezel from Rick's, the one made for AC-equipped cars. There's no way to cut the non-A/C bezel and make it look right.
You may have to then cut a rectangular whole in the sheet metal behind the bezel, but you won't need to be precise because it will be covered by the stock vent and the bezel itself.
I used a pair of angled snips and a mini hack saw to cut the holes. Drill a starter hole first, of course.